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Note 10 - Accrued Liabilities and Other Liabilities - Noncurrent - Changes in Warranty Reserve (Details) - USD ($)
9 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2019
Beginning balance $ 150,229 $ 99,216
Warranty provision 2,396 85,078
Warranty settlements (20,303) (34,065)
Ending balance $ 132,322 $ 150,229